Question

i) A photocell is used to automatically
switch on the street lights in the evening
when the sunlight is low in intensity.
Thus it has to work with visible light. The
material of the cathode of the photo cell
is
(A) zinc
(B) aluminum
(C) nickel
(D) potassium​

Answer 1

Answer:

(B) aluminum..............

Answer 2

Answer:

Option D is correct. Potassium

Explanation:

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